Socket.io：如何正确加入和离开房间

Question

我正在尝试通过构建一组动态创建的聊天室来学习Socket.io，这些聊天室在用户进入和离开时会发出“已连接”和“已断开”消息。看着问题，我已经把一些功能，但大多数链接的响应是从谁承认自己已成功侵入一起答案的人，我已经注意到有一个更普遍的-和最近-
有关的权利的方式来讨论在Socket.io存储库上执行此操作（尤其是在此处和此处）

因为我是个新手，所以我不知道下面的工作是否是可以接受的处理方式，或者它只是偶然地起作用，但会导致性能问题或导致过多的侦听器。如果有一种理想且正式的方式来加入和离开房间，感觉比以前那么笨拙，我很乐意对此进行了解。

客户

var roomId = ChatRoomData._id // comes from a factory


function init() {

    // Make sure the Socket is connected
    if (!Socket.socket) {
        Socket.connect();
    }

    // Sends roomId to server
    Socket.on('connect', function() {
        Socket.emit('room', roomId);
    });

    // Remove the event listener when the controller instance is destroyed
    $scope.$on('$destroy', function () {
        Socket.removeListener('connect');
    });

}

init();

服务器

  io.sockets.once('connection', function(socket){
    socket.on('room', function(room){     // take room variable from client side
      socket.join(room) // and join it

      io.sockets.in(room).emit('message', {      // Emits a status message to the connect room when a socket client is connected
        type: 'status',
        text: 'Is now connected',
        created: Date.now(),
        username: socket.request.user.username
      });

      socket.on('disconnect', function () {   // Emits a status message to the connected room when a socket client is disconnected
        io.sockets.in(room).emit({ 
          type: 'status',
          text: 'disconnected',
          created: Date.now(),
          username: socket.request.user.username
        });  
      })
  });

Answer 1

Socket.IO ：最近发布的 v2.0.3

要 加入 一个房间一样简单socket.join('roomName'）

//:JOIN:Client Supplied Room
socket.on('subscribe',function(room){  
  try{
    console.log('[socket]','join room :',room)
    socket.join(room);
    socket.to(room).emit('user joined', socket.id);
  }catch(e){
    console.log('[error]','join room :',e);
    socket.emit('error','couldnt perform requested action');
  }
})

并 离开 房间，就这么简单socket.leave('roomName');：

//:LEAVE:Client Supplied Room
socket.on('unsubscribe',function(room){  
  try{
    console.log('[socket]','leave room :', room);
    socket.leave(room);
    socket.to(room).emit('user left', socket.id);
  }catch(e){
    console.log('[error]','leave room :', e);
    socket.emit('error','couldnt perform requested action');
  }
})

通知房间房间用户正在断开连接

断开连接事件时无法获取客户端当前所在的房间列表

已修复（添加“断开连接”事件以在断开连接时访问socket.rooms）

 socket.on('disconnect', function(){(
    /*
      socket.rooms is empty here 
      leaveAll() has already been called
    */
 });
 socket.on('disconnecting', function(){
   // socket.rooms should isn't empty here 
   var rooms = socket.rooms.slice();
   /*
     here you can iterate over the rooms and emit to each
     of those rooms where the disconnecting user was. 
   */
 });

现在发送到特定房间：

// sending to all clients in 'roomName' room except sender
  socket.to('roomName').emit('event', 'content');

Socket.IO发射备忘单